Automatic stoking device for furnaces.



No. 885,635. PATENTED APR. 21, 1908.

T. E. MURRAY. AUTOMATIC STOKING DEVICE FOR FURNACES.

PPLIO TION FILED NOV. 2 A A 1907 6 SHEETSSHEET 1.

o meooooqoeadooooO GQ o oooefioooonooooboo IIIIIIII ATTORNEY No. 885,635. 'PATENTED APR. 21, 1908. T. E. MURRAY.

AUTOMATIC STOK ING DEVICE FOR FURNACES.

APPLICATION FILED NOV.2, 1907.

6 SHEETSSHEET 2.

WITNESSES: INVENTOR 36mm 9. 9mm

' fiMA/XW.

No. 885,635. A PATENTED APR. 21, 1908.

T E. MURRAY;

AUTOMATIC STOKING DEVICE FOR FURNACES.

APPLIOATION FILED NOV.2, 1907.

6 SHEETS-SHEET 4.

WI/NESSES: INVENTOR BY wflg w ATTORNEY 5 5. PATENTED APR.Z1 190s. N0 88 T. E. MURRAY.

AUTOMATIC STOKING DEVICE FOR FURNACES.

I v. v APPL OATION FILED N9 2,1907 6 sHEETs SHEET 5' WITNESSES: INVENTOR %Wd 9%, flfiam,

PATENTED APR. 21; 1908.

T. E. MURRAY.

APPLICATION FILED NOV.2,1907.

e SHEETS-SHEET a.

AUTOMATIO STOKING DEVICE FOR FURNACES.

k mm u INVENTOR ATTORNEY WITNESSES:

' York, in the county of New 'York and State j of New York, have, invented a certain new I and useful Improvement in Automatic Stok-- ing Devices for Furnaces, of which the fol- I Specification of Letters Patent.

I Patented April 21, 1908. I

Application filed November 2, 1907, Serial No. 400,375.

To all whom it. may concern:

Be it known that I, THOMAS E. MURRAY, a citizen of the United States, residing at New lowing is a specification. Y

The invention relates to automatic .stoking furnaces, and consists in the combination of the inclined ate, two inclined troughs disposed paralle to saidgrate, in 'uxta ositioii thereto, and receiving fuel at t eir e evated ends, and means for moving said fuel into and down said inclined troughs alternately:

' also in the combination of an inclined grate,

. from a receivin box into the inclined troughs an inclined trough parallel to said in 'uxtaposition thereto, andreceiving fuel vat its elevated end, a pusher block in said trough and means for reciprocating said block whereby said fuel is moved down the incline when the block travels in one direction and raised upwardly to flow over the ate when the block travels in the op osite irection: also in the form of the. usher lock whereby it is caused to push an lift the fuel alternately; also in the means for operatin said pusher blocks and for moving the fue in the manner escribed; also in the arrangement of ducts for supplying air both below and above the .grate an also in the various combinations more particularly recited in the claims. a v

In the accompanying drawings--'Fig .ure 1 is an end view taken in the direction of the arrowa, Fi 2. Fi 2 ha horizontal section on the inc 2 2 0 Fig. 1. Fig. '3 is a section on the line 3.3 of Fig. 2. Fig. 4 is an enlarged partial section on the line 2.2 ofFi'g. .1, showing the elevated ends of the grates and fuel troughs, mechanism for reciprocating the pusher blocks, and with the wall of the furnace broken away toex'hibit the air duct for delivering air above the grates.

Fig. 5 is a section on the line 5 5 of Fig. 6 the.

" usher H being shown inside elevation. Fig. 6 isa section .on the line 6 6 of Fig. 5 the block '40 being shownin side elevation. Fig. 7is a section on the line 7 7 of Fig. 2.- Fig. 8

, is a section of the end of hand lever '35 showving said lever applied to the segmental-block pivot pin 21. 7

Similar numbers and letters of reference indicate like parts.

The grates A, of which there may be any ate andbe a parent t desired number, are formed of hollow twyers 8 disposed ste fashion one abovegthe other as shown in ig. 7, so as to present an inclined surface extending from the furnace wall 9 downward to the transverse supporting plate 10. Each grate forms the upper wall of an air tank 11, .Fig. 7, which at .its

elevated end is closed and which at its lower end communicatesby opening 12,Fig. 7 with a transverse air duct 13. Said duct may receive air blast from any suitable device delivered through apertures 38*, Fig. 3. The I air trunks 11, at their elevated ends, are closed. The end trunk 38 communicates (Fig. 4, also dotted lines Figs. 1 and 7 and --this,with the transverse passage .16 formed between the web girders 17 embedded in the furnace wall 18. Extending through the web of the inner girder and transversely tl rough the furnace wall 18 are flared ducts 19 (Fig. 4) the outlet of each duct being directly over the elevated end of a-grate A. In the vertical passage 15 is a valve 20 operated by a han part of the air entering the trunk38 goes by the vertical passage 15 to the transverse passage 16 and thence through the flared ducts 19 to the fire space above the ates. It will the ow of air from ducts 19 to the'fire space can be regulated as desired. The object of admitting air above the grates is to improve the combustion and consume smoke.-

Between the, grates A are inclined troughs B, the grates and troughsbeing parallel and in juxtaposition. At their elevated ends these troughs all communicate with'a trans- I verse box C extending acrossthe front of the furnace, into which box the fuel passes from the detachable hopper 'K. At' the depressed end of each trough is a horizontal fuel receiving platform D, Fig. 3, and in the space between the platforms D and the, furnace wall E- are ivoted grates F. These grates'turn (dotted lines Fig. 7) on pivots G and may be operated to. dump ashes, etc. into the ash receptacles L, by means of a hand lever (dotted lines Fig. 3).

Fuel supplied to 'the'hogper C may enter all'ofthe inclined troughs at by means 0 the valve '20,,

wheel. By reason of this construction,

and is caused to 'de'scend the inclinesto .the platforms 10,

whence it passes to the dumping grates F.

Because the troughs are between and beside the grates the fuel traversing them also rise over the twyers 8 and combustion of 50 tion. (arrow Fig. )-and thus to cause it to said fuel on said twyers will be maintained trough, upon w 'ch bottom said block may rest. The u per surface of the block is prefably rounde Viewed edgewise (Fig.5) the block has the contour of a right angled triangle of which the hypotenuse is horizontal and one side is parallel to the bottom of the trough and the other side at right angles thereto. The reason for this shaping of the blocks H will be ex lained further on.

Extending throug each block and secured thereto by a nut is a rod I, the end of which is bent upwardly and received in an eye on the end of one arm of a ivoted lever J, Fi 4. Each ivoted lever thus connects wit a pair of blbcks as H, H, Fig. 4, which blocks are disposed in the troughs B, which alternate with the grates.

It'will be obvious that by vibrating the lever J on its pivot the blocks H, H, will be reciprocated' and caused to move lengthwise the troughs in relatively opposite directions. It will also be seen that as one block as'H' moves upwardly from the position shown in full linesFig. 4, to the position shown in "dotted lines the other block H moves downpushes the fuelin front of the face M down one pusher block the incline. It also follows that in the plurality of troughs here illustrated, half of the total'number of blocks are descending, while the other half are ascending the inclines. I

Recurring again to the shape of the blocks H. When said blocks are ascending the incline their wedge form and upper rounded surface permits them to be drawn through the fuel with little resistance. And, further more, the action of themoving wed e is to lift the fuel in the trough in a vertica direcoverflow upon the adjacent grate-surfaces. Hence, consideri the reci rocation of any when-t at block moves downwardly its inclined trough forces the fuel ahead of it .down the incline, and when it vmoves upwardly in said trough (and while it is drawn through the fuel) it raises the fuel j vertically, and so that said fuel flows over to and upon the grates.

The mechanism for feeding the fuel into the troughs B and for vibratin the pivoted lever J is as follows: The fixe pivot pin 21 of each lever serves also as the pivot of a segmental block 22, here in the form of a usher block H. The lower faceM quadrant. (Fig. 4.) All of the blocks 22 are pivoted in their upper faces by pins 23 to a ongitudinal bar 24, one end of which passes through an opening 25 in the end wall of box 0 and carries a roller stud .26, which enters the circumferential roove 27 of a rotary cam 28. Said cam is carried by a shaft 29, Fig. 4, journaled in box C and in one of the supporting columns 30 of the furnace, and may be provided with sprocket teeth 31 to receive a belt leading from a motor (not shown) whereby said cam is rotated. As the cam is rotated, and throu h the agency of the connecting bar 24, tie blocks 22 are vibrated as shown in Fig. 4, from the position s own in dotted lines, or vice versa, as indicated by the arrows. The vertical faces of each block 22 then strike alternately the turned up ends of the rods 1, which are connected to the endsof the lever J, thus vibrating all of said levers J and hence reciprocating the pusher blocks in their troughs in the manner already described.

The segmental blocks 22 serve also to move the fuel from the receiving box G into the troughs B.

Assuming a iven block to be in the position shown in 1 lines, Fig. 4, it is obvious that fuel placed in the hopper K will descend in front of the vertical face 40 of said block, and when said block is turned on its pivot said fuel will be pushed by face 40 into the opening of the trough shown at 41, Figs. 5 and 6.

Any pair of pusher blocks may be operated by hand in the following manner. Ihe hopper K is removable, its outer wall being secured to the flanged upper front edge of the box 0 by bolts and nuts 32, Figs. 1 and 5. On the curved face of each segmental block 22 is cast an upwardly projecting polygonal lug 33. The hopper belng taken off and the pivot pin 23 connecting the segmental block to the bar 24 being removed, a lever 34 having a polygonal opening at its end receiving sald lug is applied to said hi as shown in Figs. 2 and 5, and by means 0 this lever the segmental block is vibrated to reci rocate the pair of pusher blocks associate therewith. Another way of accomplishing the same result is by means of the hand lever 35, having at its end a circular opening receiving the head ofthe pivot pin 21, and provided with downward projections 36 bearing on' the lever J, on each side of said pin, Fig. 8. The pivot pin 23, securing the segmental block to the connecting bar 24 is removed as before.

I claim 1. In a furnace, an inclined grate, two inclined troughs disposedparallel to said grate in juxtaposition thereto and on opposite sides thereof and receiving fuel at then elevated ends, pusher blocks in said troughs,

rods connected to said usher blocks, a pivoted lever, to the arms which lever said rods are respectively connected and means for vibrating said lever on its pivot to move said blocks in relatively opposite directions. 2. In a furnace, an inclined grate, two. in-

clined troughs disposed parallel'to said grate in juxtaposition thereto and on opposite,

sides thereof and receiving fuel at their elevated ends, pusher blocks said troughs,

' rods connected to said pusher blocks a sup- .blocks in said troughs, in

port, a lever pivoted on said support to the arms of which lever saidrods are respectively connected, a segmental block pivoted at its apex and disposed in front of said lever, and means for vibrating said bloclr on its pivot to cause it to strike said leverarms alternately and thereby to reciprocate said pusher relatively opposite directions. j 1

3. In a furnace, an inclined grate, two inclined troughs disposed parallel tofsaid grate in juxtaposition thereto and on op osite sides thereof and receiving fuel at thelr elevated ends, pusher blocks in said troughs,

' I rods connected to said pusher blocks, as'u "4. In a port, a lever pivoted on said support to' t e arms of which lever said rods are respectively connected, a segmental block pivotedat its apex and disposed in front of said lever, a bar pivoted to said block, a stud on said bar, and a rotary cam having a groove receiving said stud: the said cam byits rotation caus ing said bar to vibrate said blockon its pivot and the said block striking said lever arms alternately to reciprocate said pusher blocks in said troughs in relatively opposite directions.

clined fuel-receiving trough disposed parallel to said grate and in juxtaposition thereto,

and means in said trough for. alternately pushingthe fuel therein down the incline and raising said fuel vertically upward.

5. In a furnace, an inclined grate, an inclined fuel receiving trough disposed parallel to said grate and in juxtaposition thereto, and

I in said trough, a reciprocating pusher block and, in saldtrough, a reciprocating 1p I Wedge-shaped in longitudinal vertical section and disposed with-the edge of thewedge toward the top of the incline.

6. In a furnace, an inclined grate, an inclined ,fue'l receiving trough disposed parallel to said grate and in juxtaposition thereto, usher block having the form of aright ang ed triangle in longitudinal vertical section with one of its sides parallelto the inclined bottom of the trough and its hypotenuse in a horizontal plane.

7. In a furnace, an Inclined grate, an inclined fuel-receiving trough disposed parallel to saidgrate and in juxtapositionthereto,

eaaeee furnace, an inclined grate, an in-,

a pusher block in said trough and means for reciprocating said pusher block: the. said block having one face placed at an angle to push the fuel before it when said block is movin down said inclined trough, and andisposed parallel and 1n juxtaposition to and between said grates, pusher blocks in said troughs, mechanism for reciprocating the pusher blocks in each pair of troughs in relatively opposite directlonswhereby the fuel is both raised and pushed down during the operation of the stoker and means for simultaneously actuating said reciprocating mechanisms.

10. In a furnace, a plurality of inclined grates, a lurality of pairs of inclined troughs, the mem ers of each air being respectively disposed parallel and in juxtaposition to and between said grates, usher blocks in said troughs, mechanism for reci rocating the pusher blocks in eachpair o troughs in relatively opposite directions, means for simultaneously actuating said reciprocating mechanisms, and means for actuating one of i said reci rocating mechanisms independently of t e others.

11. Ina furnace, a fuel-receiving box, an

inclined grate, an inclined trough parallel to and in juxtaposition to said rate and communicating at its elevated en with said box, means in said box for moving the'fuel from said box into said trough and means in said trou'ghfor alternately pushing the fuel therein down the incline and raising said fuel vertically upward. 12. In a furnace, a fuel-receiving box, an

inclined grate, an inclined trough parallel and in juxtaposition to said grate and communicating at its elevated end with saidbox and a pivoted-segmental block in said box vandrneans for vibrating said block: the said 'block'being constructed and arranged to re-' ceive the fuel in front of one of its faces and by its vibration on its pivot to move said fuel from said box into said trough.

In testimony whereof I have affixed my signature in presence of two witnesses.

THOMAS E. MU,RRAY. .Witnesses:

GERTRUDE T. PORTER,

. PARK BENJAMIN, Jr. 

